I practiced on the rally track last Thursday during the day. I had a noisy car that got quiet without the body, and noisy with the body. It was the loose Lexan interior picking up and amplifying every vibration. Cured that with strategic dots of Shoo Goo. Ran some more rally track laps and could hear a “click” twice on the long straight. (My front tires are not excessively trued.) One click where the spring loaded guide compresses a the first valley-to-uphill transition, and once after the hump on the next valley-to-uphill transition. Testing showed the guide tapping the chassis. No dragging or scraping the track.
On the rally track the speed is less, so the Lexan vibrates much less, but was still noticeable. Without the timer running I have no idea how well it was running, but my 914/6 seemed faster immediately after the RevoSlot runs.